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Green synthesized ZnO nanoparticles against bacterial and fungal pathogens

Progress in Natural Science:Materials International 2012年第6期22卷 693-700页

作者： Sangeetha Gunalan rajeshwari sivaraj Venckatesh Rajendran Department of Biotechnology School of Life sciencesKarpagain UniversityEachanari PostCoimhatore 641021Tamilnadu.India Department of Chemistry Government Arts College.Udumalpet 642126.TamilnaduIndia

Zinc oxide nanoparticles are known to be one of the multifunctional inorganic nanoparticles with effective antibacterial *** study aims to determine the antimicrobial efficacy of green and chemical synthesized ZnO nanoparticle against various bacterial and fungal *** microbiological tests were performed using varying concentrations of green and chemical ZnO NPs with sizes 40 and 25 nm *** prove that green ZnO nanoparticles show more enhanced biocidal activity against various pathogens when compared to chemical ZnO *** effectiveness of nanoparticles increases with increasing particle dose,treatment time and synthesis method. In addition,the current study has clearly demonstrated that the particle size variation and surface area to volume ratio of green ZnO nanoparticle are responsible for significant higher antimicrobial *** the results obtained it is suggested that green ZnO NPs could be used effectively in agricultural and food safety applications and also can address future medical concerns.

关键词： Green ZnO nanoparticle Chemical ZnO nanoparticle Antimicrobial potential Bacterial pathogen Fungal pathogen

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Photocatalytic degradation of endocrine disruptor Bisphenol-A in the presence of prepared Ce_xZn_(1-x)O nanocomposites under irradiation of sunlight

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Journal of Environmental Sciences 2014年第11期26卷 2362-2368页

作者： Kamaraj M. Ranjith K.S. rajeshwari sivaraj Rajendra Kumar R.T. Hasna Abdul Salam Department of Biotechnology Dr.N.G.P. Arts and Science College Coimbatore 641048 Tamil Nadu India Advanced Materials and Devices Laboratory Department of Physics Bharathiar University Coimbatore 641046 Tamil Nadu India Department of Biotechnology School of Life Sciences Karpagam University Coimbatore 641021 Tamil Nadu India

Photocatalytic degradation of Bisphenol A （BPA）, a representative endocrine disruptor chemical, was carried out under irradiation of sunlight in the presence of CexZn1-xO nanophotocatalyst. Cerium （Ce） ions were successfully incorporated into the bulk lattice of ZnO by simple co-precipitation process. The CexZn1-xO composite nanostructures exhibited higher photocatalytic efficiency than pure ZnO in the degradation of BPA under sunlight irradiation and nearly complete mineralization of BPA was achieved. The degradation rate was strongly dependent on factors such as the size and structure of catalyst, doping material concentration, BPA concentration, catalyst load, irradiation time and pH levels. This work suggested that the CexZn1-xO assisted photocatalytic degradation is a versatile, economic, environmentally benign and efficient method for BPA removal in the aqueous environment.

关键词： Bisphenol A (BPA) ZnO CexZn1-xO Sunlight Co-precipitation Cerium

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